[4edwards]

I have a 2000 400 Honda Foreman Fourtrax. I replaced the piston and rings, now having problem setting the timing and adjusting valves. I cannot get it to start. Anyone have any suggestions???

 

[Helmut]

Welcome to the forums.

 

[4edwards]

thanks will give it a try

 

[4edwards]

I tried setting the timing mark on the T top dead center on the compression stroke, set the valves and still didn't start. When cranking over it is blowing the gas into the air cleaner and sucking in at the exhaust. Any other suggestions??

 

[Helmut]

When cranking over it is blowing the gas into the air cleaner and sucking in at the exhaust. Any other suggestions??

Sounds like it's out of time. Did you put the cam in with the lobes facing down?

 

[4edwards]

never had cam out had sleeve put in jug and replaced piston and rings

 

[Helmut]

never had cam out had sleeve put in jug and replaced piston and rings

Was it running when you tore it down and put the sleeve, piston and rings in?

 

[4edwards]

yes justed smoked bad my son got it in mudhole over seat and let it quit . i took it to a local shop had it overhauled got it back it was still smoking. when i pulled jug and piston bore size was way oversized piston was very loose no idea how it was running.

 

[Helmut]

Wait a minute, I think I'm confused. Let's start over. In the original post, were you asking me about how to set the timing and adjust the valves or were you just asking me about setting the valves? I think I misunderstood you.

You shouldn't need to mess with the timing if all you did was replace the cylinder, piston and rings.

 

[4edwards]

sorry that was my fault i did say timming and valves. that was all i repleced was piston and rings my first time into this eng just thinking it was out of time somehow because how it was is acking when cranking over thanks for taking time to help

 

[Helmut]

When you set the valves, did you have the piston on the compression stroke?

 

[4edwards]

yes comp stroke piston on top

 

[Helmut]

When cranking over it is blowing the gas into the air cleaner and sucking in at the exhaust.

This is what makes me think it's out of time. It sounds like the valves are opening at the wrong time. If you're sure it's in time and the valves are adjusted right, I'm at a loss.

You probably know this, but I need to ask to be sure. You know that when the "T" mark on the flywheel is lined up and the piston is on TDC, you can be on the compression stoke or the exhaust stroke, right? I'm just trying to make sure you didn't set the valves with the piston on TDC on the exhaust stroke, instead of the compression stroke.

 

[4edwards]

yes its on comp stroke i have tryed it both ways still doing the same thing i have been at a loss 3 days of working on it on and off

 

[Helmut]

Usually, when they blow back out the carb or suck back through the exhaust, that means they're out of time or you have bent valves. If it's in time right, I can't figure it out, unless both valves are bent. I'm lost on it.

 

[TRX2fiveO]

Did you by chance install the piston in with the "IN" stamp towards the exhaust valves?correct me if I'm wrong but this is a pushrod engine if the pushrods didn't set into the rockers correctly when you cranked it over theres a good chance you bent an intake valve.

Send me the book Helmut I need to read!!!...LOL

 

[4edwards]

had both valves out look good replaced valve seals. just cant see what could be wrong could the cam have got out somehow

 

[TRX2fiveO]

No I doubt it. I think I would look elsewhere like the carb. For the giggles if you put everything on TDC and loosen the rockers by .002 in your case would be .008, it may run. valve adjustment can be a real PITA sometimes.

 

[jon anderson]

Help me please !

havin the same issue right now , exactly! what he said is my problem , air is blowing out of intake and sucking in exhaust. i loosened up both valves so they are closed added compressed air into cylinder and have very little crankcase blow by and no valve leaks.


please call or text if ya can headin to shop to bang my head against wall

thank for your time
jon anderson
229 456 0647

 

[Lweingart]

Do these motors have a timing chain?

If so it could be bad and could have jumped a few teeth. But that's only if they have a timing chain.